...as -Wsign-promo caused other problems and has been removed again with
488823a1 "Remove -Wsign-promo."  It had
originally been introduced with e8bbb768 "ensure
correct export size type in stream operation," apparently to detect an
SvStream::operator<< call with a bool argument that would pick the "int"
overload instead of the "unsigned char" (aka sal_Bool) one (which would have
happened to trigger the -Wsign-promo warning "by luck," given that sal_Bool is
unsigned char and not signed char, say).

Change-Id: I0bf4389753e53a535bd90ca2a98b6a5be63d179a
Reviewed-on: https://gerrit.libreoffice.org/1798Reviewed-by: Luboš Luňák <l.lunak@suse.cz>
Tested-by: Luboš Luňák <l.lunak@suse.cz>